Google's Pixel 2 XL (which started shipping in October 2017) is one of the first two phones to adopt LG Display's new 6" 1440x2880 (538 PPI) pOLEDs (alongside with LG's own V30). While on paper these displays are superb, actual reviews were rather dismal - as both reviewers and customers complained about bad color reproduction, graininess and problematic viewing angles. In addition many users seem to report serious image retention issues.
According to reports in 2017, LGD faced very low yields at its 6-Gen E5 line, and so had to produce these smartphone displays at its Gen-4.5 flexible AMOLED line. Some users are now saying that these issues do not plague all of Google's phone - and some come with noticeable better displays. This should be good news for LGD and it's likely that as the company gains more experience with smartphone pOLED production, it will produce better looking displays in better yields.